| 1 |
/* Copyright (c) 1986 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* data.c - routines dealing with interpolated data. |
| 9 |
* |
| 10 |
* 6/4/86 |
| 11 |
*/ |
| 12 |
|
| 13 |
#include "standard.h" |
| 14 |
|
| 15 |
#include "color.h" |
| 16 |
|
| 17 |
#include "data.h" |
| 18 |
|
| 19 |
|
| 20 |
extern char *libpath; /* library search path */ |
| 21 |
|
| 22 |
static DATARRAY *dlist = NULL; /* data array list */ |
| 23 |
|
| 24 |
static DATARRAY *plist = NULL; /* picture list */ |
| 25 |
|
| 26 |
|
| 27 |
DATARRAY * |
| 28 |
getdata(dname) /* get data array dname */ |
| 29 |
char *dname; |
| 30 |
{ |
| 31 |
char *dfname; |
| 32 |
FILE *fp; |
| 33 |
int asize; |
| 34 |
register int i, j; |
| 35 |
register DATARRAY *dp; |
| 36 |
/* look for array in list */ |
| 37 |
for (dp = dlist; dp != NULL; dp = dp->next) |
| 38 |
if (!strcmp(dname, dp->name)) |
| 39 |
return(dp); /* found! */ |
| 40 |
|
| 41 |
/* |
| 42 |
* If we haven't loaded the data already, we will look |
| 43 |
* for it in the directorys specified by the library path. |
| 44 |
* |
| 45 |
* The file has the following format: |
| 46 |
* |
| 47 |
* N |
| 48 |
* beg0 end0 n0 |
| 49 |
* beg1 end1 n1 |
| 50 |
* . . . |
| 51 |
* begN endN nN |
| 52 |
* data, later dimensions changing faster |
| 53 |
* . . . |
| 54 |
* |
| 55 |
* For irregularly spaced points, the following can be |
| 56 |
* substituted for begi endi ni: |
| 57 |
* |
| 58 |
* @ ni p0i p1i .. pni |
| 59 |
*/ |
| 60 |
|
| 61 |
if ((dfname = getpath(dname, libpath, R_OK)) == NULL) { |
| 62 |
sprintf(errmsg, "cannot find data file \"%s\"", dname); |
| 63 |
error(USER, errmsg); |
| 64 |
} |
| 65 |
if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL) |
| 66 |
goto memerr; |
| 67 |
|
| 68 |
dp->name = savestr(dname); |
| 69 |
|
| 70 |
if ((fp = fopen(dfname, "r")) == NULL) { |
| 71 |
sprintf(errmsg, "cannot open data file \"%s\"", dfname); |
| 72 |
error(SYSTEM, errmsg); |
| 73 |
} |
| 74 |
/* get dimensions */ |
| 75 |
if (fscanf(fp, "%d", &dp->nd) != 1) |
| 76 |
goto scanerr; |
| 77 |
if (dp->nd <= 0 || dp->nd > MAXDIM) { |
| 78 |
sprintf(errmsg, "bad number of dimensions for \"%s\"", dname); |
| 79 |
error(USER, errmsg); |
| 80 |
} |
| 81 |
asize = 1; |
| 82 |
for (i = 0; i < dp->nd; i++) { |
| 83 |
if (fscanf(fp, "%lf %lf %d", |
| 84 |
&dp->dim[i].org, &dp->dim[i].siz, |
| 85 |
&dp->dim[i].ne) == 3) { |
| 86 |
dp->dim[i].siz -= dp->dim[i].org; |
| 87 |
dp->dim[i].p = NULL; |
| 88 |
} else if (fscanf(fp, "@ %d", &dp->dim[i].ne) == 1) { |
| 89 |
dp->dim[i].p = (double *)malloc(dp->dim[i].ne*sizeof(double)); |
| 90 |
if (dp->dim[i].p == NULL) |
| 91 |
goto memerr; |
| 92 |
for (j = 0; j < dp->dim[i].ne; j++) |
| 93 |
if (fscanf(fp, "%lf", &dp->dim[i].p[j]) != 1) |
| 94 |
goto scanerr; |
| 95 |
for (j = 1; j < dp->dim[i].ne-1; j++) |
| 96 |
if ((dp->dim[i].p[j-1] < dp->dim[i].p[j]) != |
| 97 |
(dp->dim[i].p[j] < dp->dim[i].p[j+1])) |
| 98 |
goto scanerr; |
| 99 |
dp->dim[i].org = dp->dim[i].p[0]; |
| 100 |
dp->dim[i].siz = dp->dim[i].p[dp->dim[i].ne-1] |
| 101 |
- dp->dim[i].p[0]; |
| 102 |
} else |
| 103 |
goto scanerr; |
| 104 |
if (dp->dim[i].siz == 0.0 || dp->dim[i].ne < 2) |
| 105 |
goto scanerr; |
| 106 |
asize *= dp->dim[i].ne; |
| 107 |
} |
| 108 |
if ((dp->arr = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL) |
| 109 |
goto memerr; |
| 110 |
|
| 111 |
for (i = 0; i < asize; i++) |
| 112 |
if (fscanf(fp, DSCANF, &dp->arr[i]) != 1) |
| 113 |
goto scanerr; |
| 114 |
|
| 115 |
fclose(fp); |
| 116 |
dp->next = dlist; |
| 117 |
return(dlist = dp); |
| 118 |
|
| 119 |
memerr: |
| 120 |
error(SYSTEM, "out of memory in getdata"); |
| 121 |
scanerr: |
| 122 |
sprintf(errmsg, "%s in data file \"%s\"", |
| 123 |
feof(fp) ? "unexpected EOF" : "bad format", dfname); |
| 124 |
error(USER, errmsg); |
| 125 |
} |
| 126 |
|
| 127 |
|
| 128 |
static double inpaspect; /* aspect ratio of input picture */ |
| 129 |
|
| 130 |
static |
| 131 |
headaspect(s) /* check string for aspect ratio */ |
| 132 |
char *s; |
| 133 |
{ |
| 134 |
if (isaspect(s)) |
| 135 |
inpaspect *= aspectval(s); |
| 136 |
} |
| 137 |
|
| 138 |
|
| 139 |
DATARRAY * |
| 140 |
getpict(pname) /* get picture pname */ |
| 141 |
char *pname; |
| 142 |
{ |
| 143 |
extern char *libpath; |
| 144 |
char *pfname; |
| 145 |
FILE *fp; |
| 146 |
COLOR *scanin; |
| 147 |
int width, height; |
| 148 |
int x, y; |
| 149 |
register int i; |
| 150 |
register DATARRAY *pp; |
| 151 |
/* look for array in list */ |
| 152 |
for (pp = plist; pp != NULL; pp = pp->next) |
| 153 |
if (!strcmp(pname, pp->name)) |
| 154 |
return(pp); /* found! */ |
| 155 |
|
| 156 |
if ((pfname = getpath(pname, libpath, R_OK)) == NULL) { |
| 157 |
sprintf(errmsg, "cannot find picture file \"%s\"", pname); |
| 158 |
error(USER, errmsg); |
| 159 |
} |
| 160 |
if ((pp = (DATARRAY *)calloc(3, sizeof(DATARRAY))) == NULL) |
| 161 |
goto memerr; |
| 162 |
|
| 163 |
pp[0].name = |
| 164 |
pp[1].name = |
| 165 |
pp[2].name = savestr(pname); |
| 166 |
|
| 167 |
if ((fp = fopen(pfname, "r")) == NULL) { |
| 168 |
sprintf(errmsg, "cannot open picture file \"%s\"", pfname); |
| 169 |
error(SYSTEM, errmsg); |
| 170 |
} |
| 171 |
/* get dimensions */ |
| 172 |
inpaspect = 1.0; |
| 173 |
getheader(fp, headaspect); |
| 174 |
if (fgetresolu(&width, &height, fp) != (YMAJOR|YDECR)) |
| 175 |
goto readerr; |
| 176 |
for (i = 0; i < 3; i++) { |
| 177 |
pp[i].nd = 2; |
| 178 |
pp[i].dim[0].ne = width; |
| 179 |
pp[i].dim[1].ne = height; |
| 180 |
pp[i].dim[0].org = |
| 181 |
pp[i].dim[1].org = 0.0; |
| 182 |
if (width <= height*inpaspect) { |
| 183 |
pp[i].dim[0].siz = 1.0; |
| 184 |
pp[i].dim[1].siz = inpaspect*(double)height/width; |
| 185 |
} else { |
| 186 |
pp[i].dim[0].siz = (double)width/height/inpaspect; |
| 187 |
pp[i].dim[1].siz = 1.0; |
| 188 |
} |
| 189 |
pp[i].arr = (DATATYPE *)malloc(width*height*sizeof(DATATYPE)); |
| 190 |
if (pp[i].arr == NULL) |
| 191 |
goto memerr; |
| 192 |
} |
| 193 |
/* load picture */ |
| 194 |
if ((scanin = (COLOR *)malloc(width*sizeof(COLOR))) == NULL) |
| 195 |
goto memerr; |
| 196 |
for (y = height-1; y >= 0; y--) { |
| 197 |
if (freadscan(scanin, width, fp) < 0) |
| 198 |
goto readerr; |
| 199 |
for (x = 0; x < width; x++) |
| 200 |
for (i = 0; i < 3; i++) |
| 201 |
pp[i].arr[x*height+y] = colval(scanin[x],i); |
| 202 |
} |
| 203 |
free((char *)scanin); |
| 204 |
fclose(fp); |
| 205 |
pp[0].next = |
| 206 |
pp[1].next = |
| 207 |
pp[2].next = plist; |
| 208 |
return(plist = pp); |
| 209 |
|
| 210 |
memerr: |
| 211 |
error(SYSTEM, "out of memory in getpict"); |
| 212 |
readerr: |
| 213 |
sprintf(errmsg, "bad picture file \"%s\"", pfname); |
| 214 |
error(USER, errmsg); |
| 215 |
} |
| 216 |
|
| 217 |
|
| 218 |
freedata(dname) /* free memory associated with dname */ |
| 219 |
char *dname; |
| 220 |
{ |
| 221 |
register DATARRAY *dp, *dpl; |
| 222 |
register int i; |
| 223 |
|
| 224 |
for (dpl = NULL, dp = dlist; dp != NULL; dpl = dp, dp = dp->next) |
| 225 |
if (!strcmp(dname, dp->name)) { |
| 226 |
if (dpl == NULL) |
| 227 |
dlist = dp->next; |
| 228 |
else |
| 229 |
dpl->next = dp->next; |
| 230 |
free((char *)dp->arr); |
| 231 |
for (i = 0; i < dp->nd; i++) |
| 232 |
if (dp->dim[i].p != NULL) |
| 233 |
free((char *)dp->dim[i].p); |
| 234 |
freestr(dp->name); |
| 235 |
free((char *)dp); |
| 236 |
return; |
| 237 |
} |
| 238 |
} |
| 239 |
|
| 240 |
|
| 241 |
freepict(pname) /* free memory associated with pname */ |
| 242 |
char *pname; |
| 243 |
{ |
| 244 |
register DATARRAY *pp, *ppl; |
| 245 |
|
| 246 |
for (ppl = NULL, pp = plist; pp != NULL; ppl = pp, pp = pp->next) |
| 247 |
if (!strcmp(pname, pp->name)) { |
| 248 |
if (ppl == NULL) |
| 249 |
plist = pp->next; |
| 250 |
else |
| 251 |
ppl->next = pp->next; |
| 252 |
free((char *)pp[0].arr); |
| 253 |
free((char *)pp[1].arr); |
| 254 |
free((char *)pp[2].arr); |
| 255 |
freestr(pp[0].name); |
| 256 |
free((char *)pp); |
| 257 |
return; |
| 258 |
} |
| 259 |
} |
| 260 |
|
| 261 |
|
| 262 |
double |
| 263 |
datavalue(dp, pt) /* interpolate data value at a point */ |
| 264 |
register DATARRAY *dp; |
| 265 |
double *pt; |
| 266 |
{ |
| 267 |
DATARRAY sd; |
| 268 |
int asize; |
| 269 |
register int i; |
| 270 |
double x, y, y0, y1; |
| 271 |
/* set up dimensions for recursion */ |
| 272 |
sd.nd = dp->nd - 1; |
| 273 |
asize = 1; |
| 274 |
for (i = 0; i < sd.nd; i++) { |
| 275 |
sd.dim[i].org = dp->dim[i+1].org; |
| 276 |
sd.dim[i].siz = dp->dim[i+1].siz; |
| 277 |
sd.dim[i].p = dp->dim[i+1].p; |
| 278 |
asize *= sd.dim[i].ne = dp->dim[i+1].ne; |
| 279 |
} |
| 280 |
/* get independent variable */ |
| 281 |
if (dp->dim[0].p == NULL) { /* evenly spaced points */ |
| 282 |
x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz; |
| 283 |
x = x * (dp->dim[0].ne - 1); |
| 284 |
i = x; |
| 285 |
if (i < 0) |
| 286 |
i = 0; |
| 287 |
else if (i > dp->dim[0].ne - 2) |
| 288 |
i = dp->dim[0].ne - 2; |
| 289 |
} else { /* unevenly spaced points */ |
| 290 |
if (dp->dim[0].siz > 0.0) |
| 291 |
for (i = 0; i < dp->dim[0].ne; i++) |
| 292 |
if (pt[0] < dp->dim[0].p[i]) |
| 293 |
break; |
| 294 |
else |
| 295 |
for (i = 0; i < dp->dim[0].ne; i++) |
| 296 |
if (pt[0] >= dp->dim[0].p[i]) |
| 297 |
break; |
| 298 |
if (i <= 0) |
| 299 |
i = 0; |
| 300 |
else if (i >= dp->dim[0].ne) |
| 301 |
i = dp->dim[0].ne - 2; |
| 302 |
else |
| 303 |
i--; |
| 304 |
x = i + (pt[0] - dp->dim[0].p[i]) / |
| 305 |
(dp->dim[0].p[i+1] - dp->dim[0].p[i]); |
| 306 |
} |
| 307 |
/* get dependent variable */ |
| 308 |
if (dp->nd == 1) { |
| 309 |
y0 = dp->arr[i]; |
| 310 |
y1 = dp->arr[i+1]; |
| 311 |
} else { |
| 312 |
sd.arr = &dp->arr[i*asize]; |
| 313 |
y0 = datavalue(&sd, pt+1); |
| 314 |
sd.arr = &dp->arr[(i+1)*asize]; |
| 315 |
y1 = datavalue(&sd, pt+1); |
| 316 |
} |
| 317 |
/* |
| 318 |
* Extrapolate as far as one division, then |
| 319 |
* taper off harmonically to zero. |
| 320 |
*/ |
| 321 |
if (x > i+2) |
| 322 |
y = (2*y1-y0)/(x-i-1); |
| 323 |
else if (x < i-1) |
| 324 |
y = (2*y0-y1)/(i-x); |
| 325 |
else |
| 326 |
y = y0*((i+1)-x) + y1*(x-i); |
| 327 |
|
| 328 |
return(y); |
| 329 |
} |
